have a good talk with him.
his past is his responsibility, and his other kids are also his responsibility. if he is still sending money at least, it shows that he is a good man at heart.
after the talk, you will need to calm down and accept that his past is his past and no one can change it. look forward to the future with him and your unborn child. that's more important.
in future, if his kids would like to know who their father is, why not? he will have to make that decision himself, as long as you know.
if he decided to cut ties, it's also his choice. and maybe, this decision will be in your favor.
stay calm.
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